My RIA GI had an occasional misfeed when it was new. Tuning the extractor improved it a bunch, but still wasn't perfect. Turns out that gun didn't like the Novak (ACT) mags that it came with all that well. Switched to using only Colt-spec mags in that gun, and no further problems.
There was a day not too long ago that I would have said a 1911 wasn't worth that kind of bother. What a dummy. Really was no big deal....
